How can I remove a virus from my MacBook Air?

Scam pop-up

1. Click  in the menu bar and choose “Force Quit”.

In the window that opens up, select “Safari” and click “Force Quit.

2. Relaunch Safari holding the shift key down.

Remove Adware/Malware

1. Use Malwarebytes Anti-Malware for Mac to remove adware/malware.

https://www.malwarebytes.org/antimalware/mac/

Download, install , open, and run it by clicking “Scan for Adware” button to remove adware.

Once done, quit Malwarebytes Anti-Malware for Mac.

2. Disable Extensions and test.

Safari > Preferences > Extensions

Select and disable all extensions and test.

Enable Extensions one by one and test.

To uninstall any extension, select it and click the “Uninstall” button.

3. Safari > Preferences > Search > Search engine:

Select your preferred search engine.

4. Visit the site you want it to be the Home page

Safari > Preferences > General > Homepage

Click the button “Set to Current Page” button.

5. Restart your Mac.